The coordinate grid shows the plot of four equations. a coordinate plane is shown with four lines graphed. line a crosses the x axis at negative 3.2 and has a slope of 4. line b crosses the x axis at 3 and the y axis at 6. line c crosses the x axis at 1.5 and the y axis at negative 6. line d crosses the x axis at negative 3 and the y axis at 3. which set of equations has (2, 2) as its solution? a and d b and d a and c b and c

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables